How to: Create a Procedure that Returns a Value (Visual Basic)
You use a Function procedure to return a value to the calling code.
To create a procedure that returns a value
Outside any other procedure, use a Function statement, followed by an End Function statement.
In the Function statement, follow the Function keyword with the name of the procedure, and then the parameter list in parentheses.
Follow the parentheses with an As clause to specify the data type of the returned value.
Place the procedure's code statements between the Function and End Function statements.
Use a Return statement to return the value to the calling code.
The following Function procedure calculates the longest side, or hypotenuse, of a right triangle, given the values for the other two sides.
The following example shows a typical call to hypotenuse.